Aseismatic device for doors

Abstract

An aseismatic device for a door comprises a main portion and a roller-bearing plate. The main portion includes a plate capable of being attached to one upper corner of one side door, which is to be closed and locked. The plate is provided with a longitudinally rotatable roller in such a manner that it projects somewhat upwardly and with a laterally rotatable roller in such a manner that it projects somewhat laterally. The roller-bearing plate is capable of being attached to one corner portion of a door frame corresponding to said main portion, and has a pair of planes for bearing said rollers. The main portion and the roller-bearing plate are arranged in such a manner that the rollers are normally not in contact with said bearing planes.

What is claimed is: 
     
       1. An aseismatic device for a door comprising a main portion 3 and a roller-bearing plate 16, wherein said main portion 3 includes a plate 5 capable of being attached to one upper corner of one side of said door, which is to be closed and locked, said plate 5 being provided with a longitudinally rotatable roller 9 in such a manner that it projects somewhat upwardly and with a laterally rotatable roller 12 in such a manner that it projects somewhat laterally; and wherein said roller-bearing plate 16 is capable of being attached to one corner portion of a door frame corresponding to said main portion 3, and has a pair of planes 17 and 18 for bearing said rollers 9 and 12; said main portion 3 and said roller-bearing plate 16 being arranged in such a manner that said rollers 9 and 12 are normally not in contact with said bearing planes 17 and 18.